I am trying to catch up my reference studies. While flipping the pages of the newest issue of “CERN COURIER” (available online at http://cerncourier.com/cws/article/cern/66876), Volume 56, Number 10, December 2016, I was attracted to one of the News – “CLOUD experiment sharpens climate predictions”. I simply picked the title of this News article as the title of this blog post.
For those who don’t have time to read the article, “CLOUD” stands for Cosmic Leaving Outdoor Droplets, which is an experiment at CERN to understand the aerosol particles in the atmosphere and their effects on cloud.
“The new CLOUD study establishes the main processes responsible for new particle formation throughout the troposphere, which is the source of around half of all cloud seed particles”, said in this article.
“Aerosol particles form when certain trace vapors in the atmosphere cluster together, and grow via condensation to a sufficient size that they can seed cloud droplets. Higher concentration of aerosol particles make cloud more reflective and long-lived, thereby cooling the climate, and it is thought that the increased concentration of aerosols caused by air pollution since the start of the industrial period has offset a large part of the warming caused by greenhouse-gas emissions.” – also quoted from this article.
The CLOUD collaboration has published an article in Science (E.M. Dunne et al., Science, 10.1126/science.aaf2649, 2016), titled as “Global atmospheric particle formation from CERN CLOUD measurements”. It is a interesting article to read.
This reminded me a PRL paper by Henrik Svensmark, “Influence of Cosmic Rays on Earth’s Climate” [PRL 81, Number 22, 5027 (1998)], and the correlation between the Earth’s cloud coverage and the cosmic ray fluxes over the time.